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US8542168B2 - Display device - Google Patents
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US8542168B2 - Display device - Google Patents

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US8542168B2
US8542168B2 US11/857,474 US85747407A US8542168B2 US 8542168 B2 US8542168 B2 US 8542168B2 US 85747407 A US85747407 A US 85747407A US 8542168 B2 US8542168 B2 US 8542168B2
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Prior art keywords
field
display device
scan line
luminance
voltage
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US11/857,474
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US20080068299A1 (en
Inventor
Ikuko Mori
Kikuo Ono
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Magnolia Purple Corp
Panasonic Intellectual Property Corp of America
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Panasonic Liquid Crystal Display Co Ltd
Hitachi Displays Ltd
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Assigned to HITACHI DISPLAYS, LTD. reassignment HITACHI DISPLAYS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MORI, IKUKO, ONO, KIKUO
Publication of US20080068299A1 publication Critical patent/US20080068299A1/en
Assigned to PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD. reassignment PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD. MERGER Assignors: IPS ALPHA SUPPORT CO., LTD.
Assigned to IPS ALPHA SUPPORT CO., LTD. reassignment IPS ALPHA SUPPORT CO., LTD. COMPANY SPLIT PLAN TRANSFERRING FIFTY (50) PERCENT SHARE IN PATENT APPLICATIONS Assignors: HITACHI DISPLAYS, LTD.
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Assigned to PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA reassignment PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA NUNC PRO TUNC ASSIGNMENT Assignors: PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.
Assigned to JAPAN DISPLAY, INC. reassignment JAPAN DISPLAY, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: Japan Display East, inc.
Assigned to Japan Display East, inc. reassignment Japan Display East, inc. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: HITACHI DISPLAYS, LTD.
Assigned to JAPAN DISPLAY, INC. reassignment JAPAN DISPLAY, INC. CHANGE OF ADDRESS Assignors: JAPAN DISPLAY, INC.
Assigned to MAGNOLIA PURPLE CORPORATION reassignment MAGNOLIA PURPLE CORPORATION ASSIGNMENT OF ASSIGNOR'S INTEREST Assignors: JAPAN DISPLAY INC
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/16—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source
    • G09G3/18—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source using liquid crystals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/205—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic
    • H04N5/208—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0205—Simultaneous scanning of several lines in flat panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0252—Improving the response speed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0435—Change or adaptation of the frame rate of the video stream
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods
    • G09G3/2081—Display of intermediate tones by a combination of two or more gradation control methods with combination of amplitude modulation and time modulation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]

Definitions

  • the present invention relates to a hold-response-type display device such as a liquid crystal display device or an organic EL display and, more particularly, to a display device suitable for a large screen and display of a moving picture.
  • a number of pixels are formed in a matrix and are surrounded by data signal lines extending in the vertical direction and arranged in the lateral direction and scan lines extending in the lateral direction and arranged in the vertical direction.
  • data signal lines extending in the vertical direction and arranged in the lateral direction
  • scan lines extending in the lateral direction and arranged in the vertical direction.
  • a liquid crystal display device and an organic EL display device have another problem such that the picture quality of a moving picture is not sufficiently high due to the following phenomenon.
  • the display devices are largely divided into an impulse-response-type display and a hold-response-type display.
  • the impulse-response-type display is of a type in which luminance response decreases immediately after a scan like the light emission characteristic of a cathode ray tube.
  • the hold-response display is of a type in which luminance based on display data is held to the next scan like a liquid crystal display.
  • the hold-response-type display can display a flicker-free still picture having excellent quality
  • a moving picture blurring that the surrounding of a moving object in a moving picture is blurred occurs.
  • the moving picture blurring occurs due to a so-called afterimage.
  • the user moves his/her visual line along a moving object, the user interpolates display images before and after the display image whose luminance is held. Therefore, even if the response of the display is increased, the moving picture blurring is not completely prevented.
  • a method of updating a display image at a shorter frequency and a method of cancelling an afterimage by insertion of a black screen so that the display becomes like an impulse-response-type display are effective.
  • a representative display requested to display a moving picture is a television receiver set.
  • the frequency of the television receiver set is a standardized signal such as 60 Hz in an NTSC signal and 50 Hz in a PAL signal.
  • the frame frequency of a display image generated on the basis of the frequency is set to 60 Hz or 50 Hz, due to low frequency, the moving picture blurring occurs.
  • Japanese Patent Application Laid-Open Publication No. 2005-6275 discloses the technique.
  • the technique of inserting a black frame (black image) includes a technique of inserting black display data between display data (hereinbelow, simply called black display data insertion method) and a technique of repeating turn-on and turn-off of a backlight (hereinbelow, simply called blink backlight method).
  • black display data insertion method a technique of inserting black display data between display data
  • a technique of repeating turn-on and turn-off of a backlight hereinbelow, simply called blink backlight method.
  • the technique is disclosed in Japanese Patent Application Laid-Open Publication No. 2003-280599.
  • the problem of the countermeasure against the moving picture blurring is as follows.
  • interpolation frame generating method display data which is not originally present is formed. Accordingly, in an attempt to generate more accurate data, the circuit scale enlarges. On the other hand, when the circuit scale is suppressed, an interpolation error occurs.
  • the method of inserting the black frame in principle, no interpolation error occurs. Also from the viewpoint of the circuit scale, the method is more advantageous than the interpolation frame generating method. However, in both of the black display data insertion method and the blink backlight method, luminance at all of levels of gray decreases only by the amount of black frames.
  • FIG. 2 shows the relation between the tone and luminance in the two fields.
  • FIG. 2 256 gray scales are displayed.
  • the first field undertakes the luminance when the gray scale is 171 or less.
  • an output from the second field may be zero. That is, when the gray scale is 171 or less, black data can be inserted without accompanying decrease in luminance.
  • the gray scale exceeds 171, for example, when the gray scale shown in FIG. 2 is 200, image data is output also from the second field.
  • the luminance is lower than that of the first field, so that moving picture blurring can be lessened.
  • one frame is formed by two fields of a light field and a dark field.
  • pre-writing is started at the time of a scan just before a scan line to be selected. Since there is a case that a side effect of the pre-writing occurs in the dark field, the pre-writing is performed in the light field, and the pre-writing is not performed in the dark field.
  • the present invention provides a display device including a number of pixels formed in a matrix and surrounded by a plurality of data signal lines extended in a vertical direction and arranged in a lateral direction and a plurality of scan lines extended in the lateral direction and arranged in the vertical direction, a scan line being selected by application of a gate voltage to the scan line, and a pixel voltage being supplied to pixels from a data signal line, wherein data of a field of relatively high luminance and a field of relatively low luminance is generated from input image data of one frame, at the time of generating an image of the field of relatively high luminance, a scan line connected to the pixel is selected twice in a row in one field and, at the time of generating an image of the field of relatively low luminance, the scan line connected to the pixel is selected once in one field.
  • the display device of (1) may be a hold-response-type display device that holds display of tone for a predetermined period.
  • the display device of (1) may be a liquid crystal display device.
  • the display device of (1) may be an organic EL display device.
  • the present invention also provides a display device including a number of pixels formed in a matrix and surrounded by a plurality of data signal lines extended in a vertical direction and arranged in a lateral direction and a plurality of scan lines extended in the lateral direction and arranged in the vertical direction, a scan line being selected by application of a gate voltage to the scan line, and a pixel voltage being supplied to pixels from a data signal line, wherein data of a field of relatively high luminance and a field of relatively low luminance is generated from input image data of one frame, at the time of generating an image of the field of relatively high luminance, two kinds of image voltages are successively supplied from the data signal line to the pixels in one field, and at the time of generating an image of the field of relatively low luminance, one kind of image voltage is supplied from the data signal line to the pixels in one field.
  • the display device of (5) may be a hold-response-type display device that holds display of tone for a predetermined period.
  • the display device of (5) may be a liquid crystal display device.
  • the display device of (5) may be an organic EL display device.
  • the present invention also provides a display device including a number of pixels formed in a matrix and surrounded by a plurality of data signal lines extended in a vertical direction and arranged in a lateral direction and a plurality of scan lines extended in the lateral direction and arranged in the vertical direction, a scan line being selected by application of a gate voltage to the scan line, and a pixel voltage being supplied to pixels from a data signal line, wherein data of three fields is generated from input image data of one frame, the three fields being a field of relatively high luminance, a field of intermediate luminance, and a field of relatively low luminance, at the time of generating an image of the field of relatively high luminance, a scan line connected to the pixel is selected twice in a row in one field, and at the time of generating an image of the field of relatively low luminance, the scan line connected to the pixel is selected once in one field.
  • the present invention provides a display device including a number of pixels formed in a matrix and surrounded by a plurality of data signal lines extended in a vertical direction and arranged in a lateral direction and a plurality of scan lines extended in the lateral direction and arranged in the vertical direction, a scan line being selected by application of a gate voltage to the scan line, and a pixel voltage being supplied to pixels from a data signal line, wherein data of three fields is generated from input image data of one frame, the three fields being a field of relatively high luminance, a field of intermediate luminance, and a field of relatively low luminance, at the time of generating an image of the field of relatively high luminance, two kinds of image voltages are supplied successively from a data signal line to pixels in one field, and at the time of generating an image of the field of relatively low luminance, one kind of image voltage is supplied from a data signal line to the pixels in one field.
  • the present invention also provides a display device including a number of pixels formed in a matrix and surrounded by a plurality of data signal lines extended in a vertical direction and arranged in a lateral direction and a plurality of scan lines extended in the lateral direction and arranged in the vertical direction, a scan line being selected by application of a gate voltage to the scan line, and a pixel voltage being supplied to pixels from a data signal line, wherein in the case where data of four or more fields of different luminance including a field of maximum luminance and a field of minimum luminance is generated from input image data of one frame and an image is formed by the fields, in a method of driving a specific field, when two frames are successively selected, if a field of luminance lower than that of the specific field is set before the specific field, a scan line connected to pixels is selected twice in a row in one field in the specific field, and when a field having luminance higher than that of the specific field is set before the specific field, a scan line connected to pixels in the specific field is selected once
  • FIG. 1 shows the configuration of a liquid crystal display device
  • FIG. 2 shows a tone-luminance characteristic in each field of a first embodiment
  • FIG. 3 shows an example of single-pulse writing in a light field
  • FIG. 4 shows an example of double-pulse writing in a light field
  • FIG. 5 shows another example of single-pulse writing in a light field
  • FIG. 6 shows another example of double-pulse writing in a light field
  • FIG. 7 shows an example of single-pulse writing in a dark field
  • FIG. 8 shows an example of double-pulse writing in a dark field
  • FIG. 9 shows another example of single-pulse writing in a dark field
  • FIG. 10 shows another example of double-pulse writing in a dark field
  • FIG. 11 shows a tone-luminance characteristic in each field of the first embodiment.
  • FIG. 1 is a diagram showing the configuration of a liquid crystal display device.
  • the device supports 256 levels of gray in each of R, G, and B colors and displays total 16,770,000 colors.
  • 101 denotes input display data of total 24 bits; eight bits of R, eight bits of G, and eight bits of B.
  • 102 denotes an input signal group.
  • the input signal group 102 is constructed by a vertical sync signal Vsync specifying one frame period (a period of displaying one screen), a horizontal sync signal Hsync specifying one horizontal period (a period of displaying one line), a display timing signal DISP specifying a display data valid period, and a reference clock signal DCLK synchronized with display data.
  • the input display data 101 , the input signal group 102 , and the drive selection signal 103 are transferred from an external system (such as a TV body, a PV body, or a cellular phone body).
  • an external system such as a TV body, a PV body, or a cellular phone body.
  • 104 denotes a timing signal generation circuit
  • 105 denotes a memory control signal group
  • 106 denotes a table initialize signal
  • 107 indicates a data selection signal
  • 108 indicates a data driver control signal group
  • 109 expresses a scan driver control signal group.
  • the data driver control signal group 108 is made of an output signal CL 1 specifying an output timing of a tone voltage on the basis of display data, an AC signal M determining the polarity of a source voltage, and a clock signal PCLK synchronized with display data.
  • the scan driver control signal group 109 is made of a shift signal CL 3 specifying the scan period of one line, and a vertical start signal FLM specifying the scan start of the head line.
  • 111 denotes memory read data that is read from the frame memory 110 on the basis of the memory control signal group 105 .
  • 112 denotes a ROM (Read Only Memory) for outputting internally stored data on the basis of a table initialize signal.
  • 113 denotes table data output from the ROM, 114 denotes a light field conversion table, 115 denotes a dark field conversion table.
  • the values in the tables are set on the basis of the table data 113 at power-on, and the memory read data 111 which is read is converted on the basis of the values set in the tables.
  • the light field conversion table 114 has the function of the data conversion circuit for light fields
  • the dark field conversion table 115 has the function of the data conversion circuit for dark fields.
  • 116 denotes light field display data converted with the light field conversion table 114 .
  • 117 denotes dark field display data converted with the dark field conversion table 115 .
  • 118 denotes a display data selection circuit which selectively outputs the light field display data 116 or the dark field display data 117 on the basis of the data selection signal 107 .
  • 119 denotes the selected field display data.
  • 122 indicates a data driver.
  • 123 denotes a data voltage generated by the data driver 122 .
  • 124 denotes a scan driver, and 125 denotes a scan line selection signal.
  • the scan driver 124 generates the scan line selection signal 125 on the basis of the scan driver control signal group 109 and outputs it to the scan line of the liquid crystal display panel.
  • 126 denotes a liquid crystal display panel
  • 127 is a schematic diagram of one pixel in the liquid crystal display panel 126 .
  • the pixel 127 is formed in an area surrounded by two scan lines 128 and two data signal lines 129 .
  • One pixel in the liquid crystal panel 126 is constructed by a TFT (Thin Film Transistor) made by a source electrode, a gate electrode, and a drain electrode, a liquid crystal layer, and opposed electrodes. By applying a scan signal to the gate electrode, the switching operation of the TFT is performed. In an open state of the TFT, the data voltage is written in the source electrode connected to one of the liquid crystal layers via the drain electrode. In a closed state, the voltage written in the source electrode is held.
  • TFT Thin Film Transistor
  • the voltage of the source electrode is the same as the voltage of a transparent electrode ITO as a pixel electrode for driving the actual liquid crystal layer.
  • the voltage of the pixel electrode is set as Vp
  • the voltage of the opposed electrode is set as Vcom.
  • the polarization direction of the liquid crystal layer changes on the basis of the potential difference between the pixel electrode voltage Vp and the opposed electrode voltage Vcom, and the amount of light transmission from a back light disposed on the back side is changed via polarizing plates disposed above and below the liquid crystal layer, thereby performing tone display.
  • FIG. 2 shows the relation between the tone and luminance of two fields.
  • 256 gray scales are displayed.
  • the first field undertakes the luminance when the gray scale is 171 or less.
  • an output from the second field may be zero. That is, when the gray scale is 171 or less, black data can be inserted without accompanying decrease in luminance.
  • the gray scale exceeds 171, for example, when the gray scale shown in FIG. 2 is 200, image data is output also from the second field.
  • the luminance is lower than that of the first field, so that moving picture blurring can be lessened.
  • the method of forming one frame by a light field and a dark field is excellent from the viewpoint that an effect similar to that of insertion of black data can be obtained without accompanying decrease in luminance.
  • image data is not sufficiently written since time in which the scan line 128 is selected is short, and a phenomenon occurs such that an image cannot be completely reproduced.
  • the circumstances in which the phenomenon that image data cannot be sufficiently written occurs vary between the case of the light field and the case of the dark field.
  • the light field and the dark field are displayed alternately.
  • the voltage Vp of the pixel electrode before the writing is lower than the data voltage Vd to be written for the reason that the pixel voltage Vp in the dark field is always lower than that in the light field.
  • the pixel voltage Vp before writing is higher than the data voltage Vd to be written. Therefore, in the following, the case of the light field and the case of the dark field will be described separately.
  • FIG. 3 shows a signal voltage write state in the normal driving method in the case of the light field.
  • the normal writing method when a specific gate line is selected, the gate signal Vg is applied and the data voltage Vd is written in the pixel electrode only in the period of the selection.
  • the writing method will be called single-pulse writing.
  • FIG. 3 shows how the potential of the pixel 127 changes when a specific scan line, for example, “n” in FIG. 1 is selected.
  • the n-th scan line is selected and the gate voltage Vg is applied to the TFT.
  • the TFT is turned on, and the data voltage Vd is written.
  • the data voltage Vd is the same as the signal voltage of the immediately preceding scan line n ⁇ 1.
  • the data voltage Vd is written to the pixel electrode.
  • the potential Vp of the pixel electrode does not immediately become the signal voltage Vd due to circuit resistance, capacitance, and the like but becomes close to the signal voltage Vd while drawing a curve like charging of a capacitor.
  • the gate voltage application time in this case is Vgt 1 .
  • the time is not sufficient for writing of the data voltage Vd. Consequently, the pixel electrode potential Vp does not increase to the data voltage Vd but below the data voltage by an unapplied voltage Vr 1 , and the TFT is turned off. That is, an image which is in accurate only by the voltage Vrt is displayed.
  • Vsf in FIG. 3 is a so-called V shift at which the pixel voltage changes due to the gate voltage.
  • Vc denotes a midpoint potential.
  • AC driving of changing the polarity of the data voltage Vd every predetermined time is performed.
  • Vc denotes the midpoint potential of the data voltage Vd used for the AC driving.
  • FIG. 4 shows a countermeasure against insufficient rise in the source electrode potential in the light field.
  • the point of FIG. 4 largely different from FIG. 3 is that the time Vgt 2 of application of the gate voltage Vg is twice as long as the time Vgt 1 of application of the gate voltage Vg in FIG. 3 .
  • the data voltage Vd in the case of the scan line n ⁇ 1 and the data voltage Vd in the scan line “n” are the same.
  • the gate voltage Vg is also applied simultaneously to the scan line “n”.
  • the signal voltage Vd can be written to the pixels corresponding to the scan line “n” for the time Vgt 2 which is twice as long as the normal gate voltage application time Vgt 1 .
  • the method will be called double-pulse writing.
  • the write time of the signal voltage Vd is long, so that the pixel electrode potential Vp can be set to almost the same level as the signal voltage Vd.
  • unapplied voltage Vr 2 in FIG. 4 is largely lower than unapplied voltage Vr 1 in FIG. 3 . Therefore, an image more accurate than that in the case of FIG. 3 can be reproduced.
  • FIGS. 3 and 4 have been described on assumption that the data voltage Vd of the scan line n ⁇ 1 and the data voltage Vd of the scan line “n” are the same.
  • FIGS. 3 and 4 show the case where the double-pulse writing is the most effective.
  • FIGS. 5 and 6 shows comparison between the double-pulse writing and single-pulse writing in the case opposite to the FIGS. 3 and 4 and where the data voltage Vd of the scan line n ⁇ 1 is zero, and the data voltage Vd of the scan line “n” is specific voltage.
  • FIG. 5 shows the case where the data voltage Vd of the scan line n ⁇ 1 is zero and the data voltage Vd of the scan line “n” is specific voltage in the single pulse writing.
  • a V shift Vsf occurs, and the voltage of the pixel electrode is increased to a middle point Vc of the data voltage.
  • the V shift requires predetermined time tfs. tfs is defined in FIG. 6 .
  • the pulse of the gate voltage Vg is applied before the pulse of the data voltage Vd only by tgd.
  • tfs is longer than tgd, so that writing of the data voltage starts before the pixel voltage Vp reaches the middle point Vc of the data voltage. That is, when the pixel voltage Vp does not reach the middle point Vc of the data voltage, the unapplied voltage Vr 1 increases.
  • FIG. 6 shows the case where the data voltage Vd of the scan line n ⁇ 1 is zero and the data voltage Vd of the scan line “n” is specific voltage in the double pulse writing.
  • the data voltage Vd of the scan line n ⁇ 1 is zero, there is no effect produced by preliminarily increasing the data voltage of the scan line “n” by the data voltage Vd of the scan line n ⁇ 1.
  • the gate voltage Vd is already applied also to the scan line “n”. Consequently, when the data voltage Vd corresponding to the scan line “n” is actually applied, the V shift Vsf is completely finished, and the data voltage Vd corresponding to the scan line “n” is applied from the middle potential Vc.
  • the unapplied voltage does not increase by the amount the pixel voltage Vp does not reach the middle point Vc of the data voltage.
  • the unapplied voltage Vr 2 in the double-pulse writing can be made smaller than that in the single-pulse writing.
  • the data voltage Vd(n ⁇ 1) in the case where the scan line n ⁇ 1 is selected and the data voltage Vd(n) in the case where the scan line “n” is selected are generally different from each other. Therefore, the influence of this in the double pulse writing has to be evaluated as follows.
  • the pixel electrode voltage Vp written by the voltage Vd(n ⁇ 1) to the scan line “n” upon writing of the scan line n ⁇ 1 is held only for the gate voltage application time Vgt 1 for the reason that the pixel electrode voltage Vp is overwritten with the original voltage Vd(n). There is consequently hardly any influence on the image Vd(n ⁇ 1).
  • the number of scan lines in a WXGA screen is 768.
  • the application time of Vd(n ⁇ 1) is one scan period, and the voltage Vd(n) is applied for the time in which 767 scan lines are scanned. Therefore, the influence on an image of Vd(n ⁇ 1) is 1/767 of the influence of Vd(n) and is ignorable. Thus, even if the double-pulse writing is used, degradation in the picture quality can be ignored.
  • FIG. 7 shows the relation between the data voltage Vd and the pixel voltage Vp in the single-pulse writing.
  • the pixel voltage Vp before writing is a predetermined voltage. It is assumed that both of the data voltage Vd to be applied in the case of the scan line n ⁇ 1 and that in the case of the scan line “n” are zero.
  • the gate voltage Vg When the gate voltage Vg is applied, the pixel voltage Vp decreases toward the data voltage Vd.
  • the application time Vgt 1 of the gate voltage Vg is insufficient, the pixel voltage Vp does not drop to the data voltage Vd. There is consequently unapplied voltage Vr 1 .
  • FIG. 8 shows the case where the double-pulse writing is applied under conditions similar to those of FIG. 7 .
  • the data voltage Vd to be applied in the case where the scan line n ⁇ 1 is selected and that in the case where the scan line “n” is selected are zero, so that decrease in the pixel voltage Vp of the scan line “n” starts when the scan line n ⁇ 1 is selected. Therefore, the write time of the data voltage Vd to the pixels in the scan line “n” is Vgt 2 which is twice as long as Vgt 1 , and sufficient write time can be assured.
  • the unapplied write voltage Vr 2 in the double-pulse writing can be made largely smaller than the unapplied write voltage Vr 1 in the single-pulse writing.
  • FIG. 8 shows the case where the double-pulse writing displays the effect most in the dark field.
  • FIG. 9 shows the case where the data voltage Vd to be applied in the scan line n ⁇ 1 is constant voltage and that in the scan line “n” is zero in the dark field in the single pulse writing.
  • the pixel voltage Vp increases by the V shift Vsf and, after that, decreases toward zero.
  • the application time Vtg 1 of the gate voltage Vg is not sufficient, the unapplied voltage Vr 1 remains in the pixel electrode.
  • FIG. 10 shows the case where the double-pulse writing is applied under the same conditions as those of FIG. 9 .
  • the data voltage Vd to be applied is constant voltage in the scan line n ⁇ 1 and is zero in the scan line “n”.
  • the gate voltage Vg is applied also to the scan line “n” in the case where the scan line n ⁇ 1 is selected
  • the pixel electrode voltage Vp on the scan line “n” rises toward the predetermined voltage Vd.
  • the rise of the pixel voltage on the scan line “n” in this case is set as Vdd.
  • the pixel electrode voltage Vp decreases toward zero. In this case as well, before the pixel electrode drops to zero, the gate voltage is turned off, and the unapplied voltage Vr 2 remains.
  • the problem of the double-pulse writing in this case is that before the data voltage Vd (zero in this case) is applied to the scan line “n”, the pixel voltage Vp is increased by the amount of Vdd by the data voltage Vd on the scan line n ⁇ 1.
  • the unapplied voltage Vr 2 in the double-pulse writing is higher than the unapplied voltage Vr 1 in the single-pulse writing only by Vdd. That is, in this case, the reproducibility of an image in the double-pulse writing is worse than that in the single-pulse writing.
  • the unapplied voltage may decrease or increase. There is a case such that the unapplied voltage increases when the double-pulse writing is employed in the dark field. It means that the picture quality in a picture as a whole is lower than that in the single-pulse writing.
  • the unapplied voltage can be always decreased. Therefore, by employing the double-pulse writing in the light field, the picture quality can be always improved.
  • the double-pulse writing is employed in the light field, and the single-pulse writing is employed in the dark field. It can reduce the problem of the write time of the data voltage Vd in the case where one frame is formed by a light field and a dark field, and the picture quality can be improved.
  • the timing signal generating circuit 104 in FIG. 1 sends data indicating that the double-pulse writing or the single-pulse writing is used to the scan driver 104 as a part of the scan driver control signal group 109 to the scan driver 124 synchronously with the data selection signal 107 instructing selection of light field display data or dark field display data. Since the present invention employs the double-pulse writing in the light field, a drive method capable of using the double-pulse writing such as a column-by-column inverting method or a frame inverting method is also employed.
  • the first embodiment solves the problem that the write time of the signal voltage Vd becomes the half in the case of reducing a moving picture blurring by dividing one frame into two fields; the light field and the dark field.
  • FIG. 2 shows the tone—luminance characteristic of each of fields in the case of dividing one frame into two fields.
  • the tone exceeds 171 in FIG. 2
  • the dark field also contributes to image formation, so that the effect of insertion of a black frame cannot be obtained. That is, when the tone exceeds 171, the effect on reduction in a moving picture blurring decreases.
  • FIG. 11 shows a method of reducing a moving picture blurring more finely by forming one frame by three fields.
  • the tone-luminance characteristic of the first field is g 1
  • the tone-luminance characteristic of the second field is g 2
  • the tone-luminance characteristic of the third field is g 3 .
  • the order of the first field, the second field, and the third field exerts an important influence on the moving picture blurring. It is assumed here that an image is displayed in order of the first field, the second field, and the third field.
  • FIG. 11 in the case of displaying 200 gray levels, the first and second fields are used and a black frame is displayed in the third field. That is, in FIG. 2 , in the case of displaying 200 gray levels, a complete black frame cannot be inserted. In contrast, in FIG. 11 , a complete black frame can be inserted also in the case of displaying 200 gray levels, and a moving picture blurring can be also accordingly reduced.
  • the 1-frame 3-field method displays an excellent effect against a moving picture blurring, but has a problem that the write time of the data voltage Vd to the pixel electrode is 1 ⁇ 3 of that of the normal case. That is, in this case, the unapplied voltage is a bigger issue as compared with that in the first embodiment. It is therefore important to consider the double-gate writing also in the 1-frame 3-field method.
  • the first field having the tone-luminance characteristic g 1 in FIG. 11 is similar to the light field in the first embodiment. Consequently, by employing the double-pulse writing, the unapplied voltage can be reduced in all of the cases. Therefore, in the second embodiment, the double-pulse writing is preferably employed in the first field.
  • the second field having the tone-luminance characteristic g 2 in FIG. 11 follows the first field, it corresponds to the dark field in the first embodiment. Therefore, in this case, by using the double-pulse writing, the unapplied voltage may decrease or increase. In this case, the double-pulse writing is not employed, but the single-pulse writing is employed.
  • the third field having the tone-luminance characteristic g 3 in FIG. 11 follows the second field.
  • the second field corresponds to the light field in the first embodiment
  • the third field corresponds to the dark field in the first embodiment. Therefore, in the case of employing the double-pulse writing, the unapplied voltage may decrease or increase in the third field, so that the single-pulse writing is employed also in the third field.
  • the double-pulse writing is used for the first field, and the single-pulse writing is employed for the subsequent fields.
  • the unapplied voltage in the field of the highest luminance having the greatest influence on formation of an image can be decreased, and deterioration in sinking of black data in a field of lower luminance is prevented.
  • an image having excellent reproducibility as a whole can be obtained.
  • the order of the three fields may be set in various ways.
  • the second embodiment relates to the case of displaying the fields in the decreasing order of luminance.
  • the third field having the tone-luminance characteristic g 3 in FIG. 11 is positioned first in a frame.
  • the second field having the tone-luminance characteristic g 2 is positioned second.
  • the first field having the tone-luminance characteristic g 1 is positioned third.
  • the first field is a field of the lowest luminance. Immediately before the first field, the lightest field in the preceding frame is displayed. Therefore, the first field is in the same state as the dark field in the first embodiment. That is, it is preferable to drive the field by the single-pulse writing.
  • the next field has the intermediate luminance which is lower than the luminance of the first field. In this case, therefore, the field is in the same state as the light field in the first embodiment. That is, it is preferable to drive the field by the double-pulse writing.
  • the last field has the highest luminance. Since the field corresponds to the light field in the first embodiment, it is preferable to drive the field by the double-pulse writing.
  • the double-pulse writing is performed in the two fields out of the three fields. Therefore, in the third embodiment, the characteristic of the double-pulse writing can be displayed easily.
  • the preceding field is a field of higher luminance or not in consideration of preceding and subsequent frames. Specifically, when the preceding frame is a field having luminance lower than that of the present field, the double-pulse writing is employed. When the preceding frame is a field having luminance higher than that of the present field, the single-pulse writing is employed. In such a manner, an image with excellent reproducibility and with little unapplied voltage can be obtained.
  • one frame may be made of four or more fields of different luminance.
  • the time of writing data to pixels is further shortened, so that the problem of the unapplied voltage is more serious. Therefore, the optimum driving method has to be set by using both of the double-pulse writing and the single-pulse writing.
  • the double pulse writing is employed for the field of the highest luminance like in the first to third embodiments.
  • the operation is performed as follows. A set of two frames is considered. When a field having a luminance higher than that of a specific field is set before the specific field, the single-pulse writing is performed for the specific field. When a field having a luminance lower than that of the specific field is set before the specific field, the double-pulse writing is performed for the specific field.
  • the display device is described as a liquid crystal display device using the TFTs in the foregoing embodiments, the invention can be also applied to an organic EL display device using TFTs as a hold-response-type display device like the liquid crystal display device.

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KR20080026033A (ko) 2008-03-24
TW200816134A (en) 2008-04-01
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EP1914710A3 (en) 2011-06-15
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JP2008076432A (ja) 2008-04-03
US20080068299A1 (en) 2008-03-20

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